The space vector pulse width modulation for reducing the circulating currents in three-level converters connected in parallel

The paper considers the problem of reducing the circulating currents in a structure of three-level converters connected in parallel upon the formation phase current of the required quality. A proposed solution for this problem is based on a new algorithm of the Space Vector Pulse Width Modulation, which allows reducing the circulating currents and improving the quality of the phase current formed by the converters. For three-level converters connected in parallel, the solution is to exclude the simultaneous realization of such switching sequences that form one and the same output voltage by different methods. In this case, there are no conditions for the circulating currents to form in. The simulation shows that the proposed algorithm allows improving the total harmonic distortion of the phase current by 3 % on average and reducing the circulating currents three times on average in comparison with other algorithms.